What kind of camping are you looking for? there are dozens of options for roadside sites, primitave hike-in sites, are car camping. The Basin, like BB hiker mentioned, is the most spectacular, though any of the sites in the area right in or around the Chisos will be jsut as beautiful. I've stayed at the Pine Canyon #2, Grapevine Hills #4, Elephant Tusk, Gravel Pit, McKinney Spring and Telephone Canyon. These are all nice and beautiful, though gravel piut isn't the most scenic. I would reccomend the Basin, that is where i play on staying in January as well. The basin is also a great place to stay because of the proximity to the chisos jiking trails, of which there are many. if you wanna get off the trail to do some hiking, check out my pages here ->
http://www.summitpost.org/show/mount...untain_id/4794 on the left toolbar are links to the other Big Bend peaks, including hundreds of pictures to help plan your trip.
feel free to ask anything if you have more questions.